X-ray sources abound around us. They include the following:
Natural X-ray sources:
Astrophysical X-ray source, as viewed in X-ray astronomy
-X-ray background
-Naturally occurring radionuclides
Artificial X-ray sources
-Radiopharmaceuticals in radiopharmacology
-Radioactive tracer
-Brachytherapy
-X-ray tube, a vacuum tube that produces X-rays when current flows through it
-X-ray laser
-X-ray generator, any of various devices using X-ray tubes, lasers, or radioisotopes
-Synchrotron, which produces X-rays as synchrotron radiation
-Cyclotron, which produces X-rays as cyclotron radiation